[jboss-jira] [JBoss JIRA] (JGRP-1765) TP: enable loopback by default and discard own multicasts

[Karim AMMOUS (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933396#comment-12933396 ] 

Karim AMMOUS commented on JGRP-1765:
------------------------------------

- Use multicast allows all members to receive the data (command) at the same time. In our system, due to non-functional requirements, we must ensure the delay between the treatment done by the emitter and the receivers is less than few dozens of milliseconds.
- Useful to synchronize many actions.
- And if there is a multicast issue, the emitter *and* the receivers won't handle the message.

                
> TP: enable loopback by default and discard own multicasts
> ---------------------------------------------------------
>
>                 Key: JGRP-1765
>                 URL: https://issues.jboss.org/browse/JGRP-1765
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>
> Enable {{TP.looback}} by default (deprecate and ignore prop): all messages sent by self are passed right to a thread pool to send them up again.
> When a multicast message sent by self is received, it is currently passed to a thread pool, de-serialized and only then discarded if loopback=true. This means that we create an unneeded buffer for de-serializationand perform de-serialization.
> SOLUTION: discard the multicast from self immediately when receiving it, in {{TP.receive()}}

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